Locomotive boiler



. 1,612 866 Jan. 4, 1927. o. H. HARTMANN LOCOMOTIVE BOILER Filed Sept. 12, 1924 3 Sheets-Sheet 1 BY 14m Jan. 4, 1927.

UNITED sT Tns PATENT OFFICE- OTTO E. O1 GASSE L-WILHELKSHOHE, GERMANY, ASSIGNOB TO SCHIIDTSCEI EIISBDAIPF-GESELLSCHAFT M. B; H., 01' GASBBIi-W HELKSHOKEIGM, A. CORPORATION OF GERIANY.

nooouorrvn norms.

Application fled September 12, 1924, Serial No. 737,812, and in Germany October 1, 1888.

M resent invention relates to locomotive 11ers and particularly to boilers of the type employing a fire box provided with water tubes, a longitudinal boiler having I smoke tubes, and a superheater located within thesesmoke tubes or some of them. The purpose of this invention is to arrange or operate a locomotive engine in such a manner that, without any substantial change in the type of construction employed hitherto, it will be possible to generate steam of higher pressure than customary heretofore. I am aware that various attempts have been made to so construct locomotive engines as 16 to enable high pressure steam to be roduced in them. It has also been rop)0 to substitute for the ordinary re x a water tube fire box of the Brotan type, and to combine a longitudinal boiler aving smoke to flues with superheaters arranged within such flues. All these experimental attempts, however, have resulted in failure, which was due chiefly to the fact that boiler scale was deposited in the water tubes of the fire box to such an extent as to soon prevent satisfactory operation. The deposit of scale was so heavy that, for instance, the tubes or rin s at the bottom of the fire box became total y obstructed, so that the supply of water to the .30 water tubes was interrupted and these tubes burned out. w

The drawbacks mentioned above are avoided according to my present invention by combining with a locomotive boiler, which may be a longitudinal boiler of the usual type having smoke flues and a smoke flue superheater, a water tube fire box wh1ch, however, is not in direct contact with the steam or. water space of the longitudinal boiler as. has been customary hitherto. The

steam, or mixture of steam and water, nerated in the water tubes of the fire ox, according to this invention, is employed for the indirect heating longitudinal boiler an is carried through a continuous circulation path throu h said boiler and back to the fire box. W 1th this arr ent, purified water can be used in thewater tubesjof the fire box, thus preventing the formation and deposit of boiler soils. A suitable way of constructing the locomotive boiler in this case involves the arr ent of tubular ,coils above the smoke tubes and within the longitudinal of the water in the boiler, the admission ends of these coils bell ing connected with the upper portion of the water tubes of the fire box, while the outlets of said coils areconnected directly with the lower portion or base ring of the fire box or they may be connected with a feed water heater through which the water produced by condensation of the heating steam passes before entering the said base ring. Preferably the water tubes of the fire box and the tubular coils within the longitudinal boiler are subdivided into several units or elements, each of which can be thrown into and out of action by itself, thereby providing a plurality of separate circulating paths for thesteam or mixture of steam and water. I am aware that it is not novel, per se, to subdivide into several units the heatin coils provided in connection with a system or the indirect heating of boilers.

Several examples of my invention have been illustrated in the accompanying drawing's, in which Fi 1 represents diagrammatically a longitu inal section of a locomotive engine having a boiler arran ed according to my invention. Figs. 2 .an 3 are vertical sections taken on the lines 22 and 33 respectively of Fig. 1. Fi 3 is a diagrammatic view showing ano er form of my invention in side elevation, and Fig. 3 is a cross-section on line 3"-3".of Fig. 3. Fig. 4 is a longitudinal section similar to Fig. 1 .but illustratin another embodiment of my invention, and -igs. 5 and 6 are transverse sections on the lines 5-5 and 6-6 respectively of Fig. 4. i

The locomotive boiler shown in Figs. 1, 2' and 3, comprises a water tube fire box 1 and a longitudinal boiler 2, having fire tubes 6: smoke tubes. The fire box is shown as coinprising a base ring 3 and upright water tubes 4, forming the side walls and the top wall-of the fire box and communicating; at the top with a longitudinal collector tube 5. At 6;. I have indicated abridge wall which may be sup orted in pgrt by means off'two suitably nt, as will be underwater tubes stood from Figs. 1 and 2. From the collector tube 5, the steam produced "within the tube system 3, 4, 5, 7, is conveyed through conduits 8 to the heating elements contained in the boiler '2, and located above the smoke tubes or fire tubes9 thereof, in which superheating elements may be arranged the above said base ring.

usual or any approved manner. The heating elements receiving the steam from the collector tube 5 may consist of coils 10 re ceiving the supply of steam from the conduits 8 by way of a header or headers 11, the other ends of said coils being connected with similar headers 12, see Fig. 3. It will be understood that the steam coming from the fire box through the conduits 8 first reaches the collectors or headers 11, then passes through the heating coils 10 to the headers 12 and from the latter returns to the base ring 3 of the firebox by way of conduits 13. A closed circulation path is thus provided. The steam produced in the fire box therefore is utilized as a heating medium for the water within the longitudinal boiler. The medium circulating within the coils 10 will be either steam or a mixture' of steam and water. This steam or this mixture gives ofi heat through the walls of the'tubes 10, to the water within the boiler and the water formed by the condensation of steam within the tubular coils 10 returns to the base ring 3, it being noted that the heating coils 10 are at a level considerably Since the path through which the steam or mixture referred to circulates is closed, there is no need of replenishing the supply of water contained therein and therefore purified water may be employed without any material in crease of expense. By the use of purified water, I am enabled to overcome entirely the danger of formation of boiler scale or of corrosion of the tubes by substances contained in impure water. In order to avoid leaks, it is desirable to construct the fire box of units made of forged or welded parts.

When. it is desired to subdivide the circulation path of the heating medium into a plurality of units, this may be done in various ways. For instance (as indicated in Figs. 1 and 3), the heating coils 10 located on one side of the central longitudinal plane of the boiler may receive steam from the connectifii 14' of the collector tube 5, while the heating coils 10 located on the other side.

ply steam through the outlet connection 15.

Similarly, the return connections-from the heating coils 10 on opposite sldes of the longitudinal central plane of the locomotive would, in this case, lead to different sections are subdivided may be increased. The advantage of having more than one circulatin path is greater security of operation. I for instance, one of the severalcirculating paths should. leak or become damaged, it can be thrown out of action. temporarily while the other circulating path or paths would still enable the locomotive to operate sufliciently either to com 'lete its trip or at least to reach the repair s 0p.

In the example of my invention illustrated by Figs. 4, 5, and 6, the headers 12' are located in the smoke box of the locomotive and the pipes 13, which receive the water condensed within. the heating elements 10, do not lead directly to the base ring 3, but first to one path of a heat exchange apparatus 16 through the other path of which circulates a medium to be heated, for instance, feed water. After having thus given off its heat to the feed water or other substance to be heated, the condensation product returns to the base ring 3 through the pipe or conduits 13, as indicated in Fig. 4. It willbe obvious that in this second form of my invention as well, the circulation path o'fthe heating steam may be subdivided into two or more sections, each independent of the othersand that various other modifications may be made without departing from the nature of my invention as set forth in the claims.

I claim:

1. A locomotive boiler plant comprising a longitudinal boiler having smoke tubes and steam superheating means in said tubes, a water tube firebox, and connections for the indirect heating of the'water in said boiler by means of the steam produced in the water tubes of the fire box.

2. A. locomotive boiler plant comprisingpath.

duced in said water tubes, said connections forming a continuous closed path, so as to return to the water tubes, any 'water resulting from the condensation of steam in said 4. A locomotive boiler plant comprising a longitudinal boiler proper, a water tube re box, a heating device located in that portion of the boiler proper which contains water under normal operating conditions, said d6- vice having an internal path closed to the interior of said boiler, and connections from said water tube fire box to the interior path of said heating device and back from said interior path to said water tube fire box, to form with the water tubes of the fire box an entirely closed system, said system comprising a space for holding water to ,be convert-' ed into steam and also comprising a space, including the internal path of said heating device, for containing the steam generate from the water contained in said system.

5. A locomotive boiler plant comprising a boiler proper, a water tube fire box, and connections, extending from the water tubes of said fire box to the water space of the boiler, for the indirect heating of the water in said boiler by means of the steam produced in said water tubes, said connections forming a continuous closed path, so as to return to the water tubes, any water resulting from the condensation of steam in said path, the water tube fire box being subdivided into a plurality of sections'havin individual connec from the steam and water s ace of the boiler proper, in such a manner t at a generation of steam in the fire box is feasible at a temperature and a pressure higher than those of the steam generated in the boiler proper.

8. A boiler plant comprising a water tube fire box constituting a steam generator havinga steam collecting space, and a boiler having a steam and water space out of connection with the first mentioned space, so that the steam produced in said generator may be of a temperature and pressure different-from those of the steam produced in said boiler.

9. A locomotive boiler plant com rising a boiler proper, a fire box formed y water tubes, a tubular heating device located within the water space of the boiler pro er at a level above the water tubes of the re box, the interior of said tubular heating device being out of communication with the boiler groper, and connections for leading to said eating device the steam produced in the water tubes of the fire box and for returning to said. water tubes any water resulting from the. condensation of the steam in said heating device. y

10. A locomotive boiler plant comprising a boiler proper, a fire box formed by water tubes, a tu ular' heating device located within the water space of the boiler proper, the interior of said tubular heating device being out of communication with the boiler rop'er, and connections for leadin to said eating tions to form a like number of separate closed ,device the steam produced in the water tubes paths for the circulation of the steam generated in said water tubes, and for the return of any water resulting from the condensation of such steam,

6. A locomotive boiler plant comprising a boiler proper, a water'tube fire box,"and connections, extending from the water tubes of said fire box to the water space of the boiler, for the indirect heating of the water in said boiler by means of the steam" produced in said water tubes, said connections formin a continuous-closed path, so as to return to t e water tubes, any water resulting from the condensation of steam in said path, and a feed .waterhefater included in the return connection from the boiler to the water tu fire box.

7. A locomotive boiler plant comprisin a boiler proper and a water tube fire box t e steam collecting space of which is separate of the fire box and for returning to said water tubes any water resulting from the condensation of the steam in said heating device.

11. The method of generating steam for locomotives which consists in heating water in tubes at the fire box of the locomotive,

causing the steam generated from such water to pass out of contact with, but in heat ex' change relation to, a. body of water inthe locomotive boiler so as to convert the water in said boilerinto steam by the heat of such steam generated in the fire box, and returning to the fire box tubes the water resultin from the condensation "of the steam whic has. heated the water in the. locomotive boiler. In testimony whereof I have'hereunto set my hand.

OTTO H. HARTMANH. 

